ESTIMATING NATURAL RECHARGE IN GRANITIC TERRAIN: AN ENTROPY APPROACH
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2011 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. An entropy-based approach is developed for estimatingnaturalrecharge in granitic terrain (in Southern India). Wells are located in weathered aquifer of this terrain, which exhibit spatial variability in natural recharge. To determinehefractional amount of rainfall, called natural recharge, marginal entropy andtransinformation of rainfall and depth tothewater table at selectedwells are calculated. Then, a ratio oftransinformation to marginalentropy of rainfall is used as a measure for assessing naturalrecharge. The mean natural recharge values at 28 wells distributeover the study area are computed for different periods. The averagrecharge rate is about 6295mm/year or 1448% of localaverage seasonal rainfall. The calculated annual input of rainfall to groundwater reserves is about 011 10 9 m 3 /year.